Idiom Definition:
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"to see stars"  
    to take a blow to the head that is hard enough that you see specks of light that resemble stars    
    or    
    to have your brain deprived of oxygen such that you see specks of light that resemble stars    
            
Synonyms: 
blackout, collapse, conk, dizziness, dizzy,  insensible, flicker, gray-out, insensibility, knockout, stupor, swoon, trance, vertigo
 
    
